D:\Documents and Settings\Riikard\Desktop\Untitled1.c: In function `main':
D:\Documents and Settings\Riikard\Desktop\Untitled1.c:12: error: `cout' undeclared (first use in this function)
D:\Documents and Settings\Riikard\Desktop\Untitled1.c:12: error: (Each undeclared identifier is reported only once
D:\Documents and Settings\Riikard\Desktop\Untitled1.c:12: error: for each function it appears in.)
D:\Documents and Settings\Riikard\Desktop\Untitled1.c:12: error: `endl' undeclared (first use in this function)
D:\Documents and Settings\Riikard\Desktop\Untitled1.c:13: error: `cin' undeclared (first use in this function)
D:\Documents and Settings\Riikard\Desktop\Untitled1.c:17: error: `davarge' undeclared (first use in this function)
D:\Documents and Settings\Riikard\Desktop\Untitled1.c:21: error: `system' undeclared (first use in this function)
D:\Documents and Settings\Riikard\Desktop\Untitled1.c:21: error: syntax error before ';' token

Execution terminated

I include iostream and all these code in the program but I still get these errors, it has happen before aswell and I got no clue why, sometimes it works sometimes it dosent, anyone knows why?

I used to get this problem when i used code blocks aswell, thats why I uninstalled codeblocks and downloaded Dev-C++ version 4.9.9.2 but now I still get the same errors.